class Record:
    def __init__(self,date,order_id,money,province):
        self.date=date
        self.order_id=order_id
        self.money=money
        self.province=province

    def __str__(self):
        # print(self.data,self.order_id,self.money,self.province)
        return f"{self.date},{self.order_id},{self.money},{self.province}"
    # 应该写return ！！！！ return f"{self.data},---------"